Blocking too many ads, though, can starve the very sites users visit. A new report released Monday says ad blocking will cost online businesses nearly $22 billion worldwide, and it will only get worse in the coming years. By 2016 ad blockers are expected to result in an estimated loss of $20.3 billion in the U.S. alone.

Adobe teamed up with Ireland-based start-up PageFair to assess the current use of ad-blocking software. For online sites that rely on advertising, including this one, the future appears to be full of challenges.

In the United States—one of the most important markets for advertisers—the use of ad-blocking software grew by 48 percent over the past year, reaching an average of 45 million active monthly users between April and June. According to the report, that means 16 percent of the U.S. online population blocked ads during the spring and early summer.

The sites hardest hit by ad-blocking software are ones that attract a young, tech-savvy audience, or have a more male audience. The report specifically calls out visitors to gaming sites as those who are “significantly more likely to block advertising.” Meanwhile, regular visitors to health, charity, and government sites are the least likely to block ads.

Why this matters: Site publishers are in a bit of pickle right now. They depend on advertising that is offering declining returns, thus requiring increasing amounts of ads to make up the difference. At the same time, site visitors install ad blockers to deal with the increase in ads and prevent advertising networks from tracking them across the web. But if too many people block ads those sites will end up starved for funding. The challenge is to find a happy medium between acceptable types of advertising and returns that will pay staff and server costs.

Mobile blocking on the horizon

The ad-blocking trend is poised to get worse as it moves to mobile platforms. Right now, mobile ad blocking is an insignificant part of the ad blocking world, the report says. It’s possible to block ads on Android, thanks to the AdBlock Plus app and browser, as well as the AdBlock extension on Firefox for mobile.

On iOS, however, ad blocking could get much bigger once iOS 9 rolls out with the Safari Content Blockers feature. This will allow users to install ad blockers for Safari on iOS—once developers build them.

If iOS users turn to ad blockers in droves, that will have a significant impact on ad-based online revenue, especially in the U.S., where iOS makes up 44 percent of smartphone marketshare, according to comScore.

While iOS may be the ad-blocking platform of the future, right now Google Chrome is the browser of choice for ad-blocking users, according to the Adobe and PageFair report. That’s ironic considering a large portion of Google’s income relies on web-based ads.

This story, "Ad-blocking software is costing websites real money" was originally published by
PCWorld.

Ian is an independent writer based in Israel who has never met a tech subject he didn't like. He primarily covers Windows, PC and gaming hardware, video and music streaming services, social networks, and browsers. When he's not covering the news he's working on how-to tips for PC users, or tuning his eGPU setup.